Before calling service personal

Check the following points before asking for support service. Refer also to “Trouble indications”. 62

CONTENTS

68

Symptom

Cause

Correction

Page

The power does not come on.

• The power cord is disconnected.

Firmly plug in the power cord.

 

19

 

 

• The lamp cover is not attached correctly.

Attach the cover correctly.

 

67

 

The power turns off while

• The ambient temperature of the projection room is too high.

Lower the ambient temperature of the projection room,

 

62

 

using the projector.

 

and turn the power on.

 

 

 

No image appears.

• The lens cover is on.

Take off the lens cover.

 

19

 

 

• The wrong input is selected.

Select the input source correctly.

 

30

 

 

• The muting mode is on.

Press MUTE to restore the picture.

 

37

 

 

• The “Brightness” adjustment is at its darkest.

Make the “Brightness” adjustment.

 

45

 

 

• The source is not correctly connected to the projector.

Connect the source correctly to the projector.

22

-

25

No sound is heard.

• The wrong input is selected.

Select the input source correctly.

 

30

 

 

• The muting mode is on.

Press MUTE to restore the sound.

 

37

 

 

• The sound volume is at it’s minimum.

Adjust the sound volume.

 

32

 

 

• The source is not correctly connected to the projector.

Connect the source correctly to the projector.

22

-

25

Desired input source cannot

• Input is not set so that it can be selected with the INPUT button. By

Set from the menu screen so that the source can be

 

45

 

be selected by the INPUT

default, only the Analog RGB(1) and Video input modes can be

selected with the INPUT button.

 

30

 

button.

selected.

 

 

 

 

Analog RGB(1) input or Y/PB/

• The COMPUTER IN 1 connector's input setting is wrong.

On the menu screen, set for the proper input signal type.

 

45

 

PR input colors are not right.

 

 

 

 

 

 

 

 

 

 

 

Analog RGB(2) input image

• The COMPUTER IN 2 connector’s input setting is wrong.

On the menu screen, set for the proper input signal type.

 

45

 

does not appear.

• The signal cable type is wrong.

Use a proper signal cable.

 

23

 

 

 

 

 

 

 

Digital RGB input image does

• The COMPUTER IN 2 connector’s input setting is wrong.

At the menu screen, set for the proper input signal type.

 

45

 

not appear.

• The signal cable type is wrong.

Use a proper signal cable.

 

23

 

The image is blurred.

• The lens is dirty.

Clean the lens with a blower or lens cleaner, etc.

 

65

 

Focusing is uneven.

• The picture is out of focus.

Focus the picture.

 

31

 

 

 

 

 

 

 

 

• The projection distance is not appropriate.

Adjust the distance properly.

 

18

 

 

• The projecting light is not hitting the screen squarely.

Adjust the projecting direction so that the light hits the

 

18

 

 

 

screen squarely.

 

 

 

 

• The “Brightness”, “Contrast”, “Sharpness” or “Phase” adjustments

Make the “Picture” adjustments.

 

45

 

 

are not correct.

 

 

 

 

The picture is dim.

• The “Brightness” or “Contrast” adjustments are not correct.

Make the “Picture” adjustments.

 

45

 

 

 

 

 

 

 

 

• The lamp life is ending.

Replace the lamp.

 

66

 

Others

Continued

Page 68
Image 68
Toshiba TLP780U TLP781U owner manual Before calling service personal, Symptom Cause Correction

TLP780U TLP781U specifications

The Toshiba TLP780U and TLP781U are opto-isolators designed to provide excellent performance in various applications, ensuring high levels of electrical isolation between input and output circuits. These devices are part of Toshiba's extensive portfolio of opto-couplers, which leverage advanced technologies to meet the demands of modern electronic systems.

One of the most notable features of the TLP780U and TLP781U is their high isolation voltage, which is rated up to 5000Vrms. This is particularly important in applications where safety and protection of sensitive components from high voltages are crucial. By providing robust electrical isolation, these opto-isolators help in preventing damage from voltage spikes and interference.

Both the TLP780U and TLP781U utilize a high-speed GaAlAs infrared LED as the light source, coupled with a phototransistor on the output side. This configuration enables rapid data transmission, making these devices suitable for high-speed applications. The TLP780U boasts a high-speed variant, while the TLP781U is designed for lower-speed requirements, offering flexibility depending on the application's needs.

In terms of package design, the TLP780U and TLP781U come in a compact and reliable DIP (Dual In-line Package) configuration. This allows for easy integration into printed circuit boards (PCBs), while also ensuring stable performance in various operational environments. Their compact size is particularly beneficial in space-constrained applications.

Another important characteristic of these devices is their wide operating temperature range, from -40°C to 100°C. This wide range ensures reliable operation in diverse environments, making them suitable for industrial, automotive, and consumer applications. This reliability is further enhanced by the devices' long operational lifespan, reducing the need for frequent replacements.

In summary, the Toshiba TLP780U and TLP781U opto-isolators deliver essential electrical isolation, high-speed performance, and versatile operational capabilities. Their combination of advanced technologies and robust features positions them as ideal solutions for interfacing circuits, signal isolation, and data transmission in various industries. Whether for safety-critical systems or general signal processing, these opto-isolators provide the performance and reliability needed in today's electronic designs.